from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField, SubmitField
from wtforms.validators import DataRequired, Length, Email, Regexp, EqualTo
from wtforms import ValidationError
from app.models.user import User

class LoginForm(FlaskForm):
    email = StringField('邮箱', validators=[
        DataRequired(), 
        Length(1, 64),
        Email()
    ])
    password = PasswordField('密码', validators=[DataRequired()])
    remember_me = BooleanField('记住我')
    submit = SubmitField('登录')

class RegistrationForm(FlaskForm):
    email = StringField('邮箱', validators=[
        DataRequired(), 
        Length(1, 64),
        Email()
    ])
    username = StringField('用户名', validators=[
        DataRequired(),
        Length(1, 64),
        Regexp('^[A-Za-z][A-Za-z0-9_.]*$', 0,
            '用户名只能包含字母、数字、下划线和点号')
    ])
    password = PasswordField('密码', validators=[
        DataRequired(),
        Length(min=8, message='密码长度至少为8个字符'),
        EqualTo('password2', message='两次输入的密码必须一致')
    ])
    password2 = PasswordField('确认密码', validators=[DataRequired()])
    submit = SubmitField('注册')
    
    def validate_email(self, field):
        if User.query.filter_by(email=field.data).first():
            raise ValidationError('该邮箱已被注册')
    
    def validate_username(self, field):
        if User.query.filter_by(username=field.data).first():
            raise ValidationError('该用户名已被使用') 